Electromagnet spool



Y 1,616,2 7 1 1927' J. w. WARDELL 0 ELECTROMAGNET S POOL Filed Jan. 16 1925 INVENTOR J4 ffffidizw EQK- ATTORN EY pool showing the coil wound thereon Patented Feb. 1, 1927.

-UNI'lED STATES PATENT OFFICE.

JOHN W. WARDELL, OF SUGAR, UTAH, ASSIGNOR OF ONE-THIRD TO JOHN S'lilILLMAN AND ONE-THIRD TO G. WAYNE STILLMAN, BOTH OF SALT LAKE CITY, UTAH.

ELEcTnoMAGNE'r SPOOL.

Application filed. January 16, 1925. Serial No. 2,749.

/ My invention relates to spools on which the insulated Wire of electro-magnets are wound, and has for its object to provide a new and economical spool having'slotted ends within which slots the endportions of the armature of the magnet are poised, and which ends are laterally and longitudinally shaped to expedite the securing of the pole pieces of the magnet thereto, and to position the said spool ends relative to the pole pieces and the I pole pieces relative to the armature.

These objects I accomplish with the device illustrated in the accompanying drawings in which similar letters and numerals of reference indicate like parts throughout the several views and as described in the specification forminga part of this application and pointed out in the appended claims.

In the drawings in which I have shown the best and most substantial embodiment ofmy invention, Figure 1 is an elevation of one of the spool ends when made of noninsulating material and with lugs for holding the spool from longitudinal movement relative to pole pieces. Figure 2 is an elevation of the end of the spool when the spool is made of insulating material. Figure?) 'is an endelevation of the spool when assembled with the pole pieces and armature in place therein. Figure 4 is an edge view of p and the armature in place therein and spaced relative to the pole pieces. .Figure 5 is a perspective of the spool core in detail.

In constructing magnet spools and assembling the armature, and pole pieces of an electro-magnet, I have found that much time may be saved and a muchrbetter spool may be made if the peripheries of the spool ends are spaced equally from the armature slot, and also when lugs are provided on the periphery of said ends to space the pole pieces re ative to the armature. p

.The present invention consists of the construction and arrangements of parts and combinations thereof as hereafter set out.-

In the drawings the ends of the spool are shown at A, and which I have given an ellippieces P are placed. An elongated slot 0 is centrally cut in each spool end A, and the endportions of the armature Dare poised in. and passed through said slot. The placing of said slot C equally from the upper and lower perimeters of said spool ends aids materially in spacing the armature D equidistant/from the pole pieces P, and when so spaced the spool ends A are held firmly in place by the pole pieces P. The core E is stamped out of a flat piece of metal and with recesses 1 cut in each end thereof, and is bent to form a hollow core. The said recesses 1 form an opening through which the assembling and poisin of the armature D is conveniently effected. The edges of said core E are soldered to the spool ends A forming a spool. The armature D is poised equidistant from the inside faces of the core E and held in place by the U-shaped wire 2.

The wire 2 is soldered to the armature D and to the outside of the spool core E. The insulated wire F is then wound around the spool core E until the necessary amount of the wire required to make the electro-magnetis wound on the core. The pole pieces P are then placed on the sides of the spool and made to bear on the chords 3 of said ends A. When the spool ends A are made of metal a slot 4 is cut from said slot C to the perimeter to prevent the electric current from shorting through the spool ends A. A cheaper form of construction is to make the spool ends A of insulating material, as shown in Figure 2, wherein the slot 4 is omitted. The pole pieces P have flat sides and edges to insure a better fastening of the spool and thereby chord portions on the perimeters thereof,.

and an elongated slot cut centrally in each end-piece and equally spaced from the chord .portions of the respective ends; an oblong core in, alinement with the slot in said end pieces; an armature poised in said core and extending through the slot in each of said end pieces; with pole pieces between which said spool closely held.

' 2. .An eleot-ro-magnet spool comprising end pieces having an elongated slot in each and segment portions cut away to form two spaced apart parallel chords; pole piecesbetween which said spool is secured and having flat sides resting on said chordlike portions of said end pieces; anoblong core fastened at its end to the respectiw e spool end and in alignment with said elongated slot; and an armature poised within and fastened 10 to said core.

In testimony whereof I have afiixed my signature.

JOHN W. WARDELL. 

